revert: remove modal tag-input auto-focus

The restore in fb925f5 was based on an observation of an older running
image, not a real regression against current main. User doesn't want the
auto-focus behavior; removing it so the modal opens without moving focus.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

app/static/js/view-modal.js

@@ -811,14 +811,6 @@ document.addEventListener('DOMContentLoaded', () => {
     modal.classList.add('active');
     updateImage(index);
     history.replaceState({ modalIndex: index }, '', window.location.href);
-    // Desktop only — skip on touch devices to avoid popping the on-screen keyboard
-    if (tagInput && !isTouchDevice()) {
-      setTimeout(() => tagInput.focus(), 100);
-    }
-  }
-
-  function isTouchDevice() {
-    return ('ontouchstart' in window) || (navigator.maxTouchPoints > 0);
   }
 
   function closeModal() {